LXR linux/arch/arm64/include/asm/pgalloc.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Based on arch/arm/include/asm/pgalloc.h
   4 *
   5 * Copyright (C) 2000-2001 Russell King
   6 * Copyright (C) 2012 ARM Ltd.
   7 */
   8#ifndef __ASM_PGALLOC_H
   9#define __ASM_PGALLOC_H
  10
  11#include <asm/pgtable-hwdef.h>
  12#include <asm/processor.h>
  13#include <asm/cacheflush.h>
  14#include <asm/tlbflush.h>
  15
  16#define __HAVE_ARCH_PGD_FREE
  17#include <asm-generic/pgalloc.h>
  18
  19#define PGD_SIZE        (PTRS_PER_PGD * sizeof(pgd_t))
  20
  21#if CONFIG_PGTABLE_LEVELS > 2
  22
  23static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
  24{
  25        set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
  26}
  27
  28static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
  29{
  30        __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE);
  31}
  32#else
  33static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
  34{
  35        BUILD_BUG();
  36}
  37#endif  /* CONFIG_PGTABLE_LEVELS > 2 */
  38
  39#if CONFIG_PGTABLE_LEVELS > 3
  40
  41static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
  42{
  43        set_p4d(p4dp, __p4d(__phys_to_p4d_val(pudp) | prot));
  44}
  45
  46static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp)
  47{
  48        __p4d_populate(p4dp, __pa(pudp), PUD_TYPE_TABLE);
  49}
  50#else
  51static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
  52{
  53        BUILD_BUG();
  54}
  55#endif  /* CONFIG_PGTABLE_LEVELS > 3 */
  56
  57extern pgd_t *pgd_alloc(struct mm_struct *mm);
  58extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
  59
  60static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
  61                                  pmdval_t prot)
  62{
  63        set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
  64}
  65
  66/*
  67 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
  68 * of the mm address space.
  69 */
  70static inline void
  71pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
  72{
  73        /*
  74         * The pmd must be loaded with the physical address of the PTE table
  75         */
  76        __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
  77}
  78
  79static inline void
  80pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
  81{
  82        __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
  83}
  84#define pmd_pgtable(pmd) pmd_page(pmd)
  85
  86#endif
  87